Massage gun



FIG. 1 is a perspective view of a massage gun showing my new design;

FIG. 2 is another perspective view thereof;

FIG. 3 is a rear elevational view thereof;

FIG. 4 is a left side view thereof; and,

FIG. 5 is a right side view thereof.

The broken lines shown in the figures are for the purpose of illustrating portions of the massage gun which form no part of the claimed design. 

CLAIM The ornamental design for a massage gun, as shown and described. 